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EP0126048A1 - Mechanical seal - Google Patents

Mechanical seal Download PDF

Info

Publication number
EP0126048A1
EP0126048A1 EP84850125A EP84850125A EP0126048A1 EP 0126048 A1 EP0126048 A1 EP 0126048A1 EP 84850125 A EP84850125 A EP 84850125A EP 84850125 A EP84850125 A EP 84850125A EP 0126048 A1 EP0126048 A1 EP 0126048A1
Authority
EP
European Patent Office
Prior art keywords
socket
shaft
ring
rotating
seal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP84850125A
Other languages
German (de)
French (fr)
Other versions
EP0126048B1 (en
Inventor
Per-Erik Leonardsson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xylem Water Solutions AB
Original Assignee
Flygt AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Flygt AB filed Critical Flygt AB
Publication of EP0126048A1 publication Critical patent/EP0126048A1/en
Application granted granted Critical
Publication of EP0126048B1 publication Critical patent/EP0126048B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
    • F16J15/3436—Pressing means
    • F16J15/344—Pressing means the pressing force being applied by means of an elastic ring supporting the slip-ring

Definitions

  • Subject application concerns a seal device for shafts comprising a rotating and a non rotating seal ring which are pressed towards each other by spring force, so-called mechanical seals.
  • Such seals are normally used in different types of machines containing rotating shafts for instance submersible machines such as pumps and turbines.
  • a protection socket for the seal is arranged, which socket also obtains the needed springforce.
  • the invention is thus characterized by that the spring force is obtained by an elastic socket, for instance made of rubber, arranged around the shaft and which is non turnable attached to the shaft by a fastening ring and which is also pressed towards the rotating seal ring.
  • an elastic socket for instance made of rubber
  • the seal ring 2 is thus meant to rotate with the shaft, while the seal ring 3 is attached to non rotating parts in the machine.
  • the spring force is obtained by a socket 4 made of flexible material, such as rubber, which may be reinforced with an insert of rigid material.
  • the socket 4 and the seal ring 2 are connected in that the socket concentrically surrounds a part of the seal ring and in that a pipe 6 is pressed around the socket while being plastically deformed.
  • a fastening ring 7 is arranged around the socket which presses the latter towards the shaft.
  • the ring 7 is connected to a grip ring 5 rigidly attached to the shaft, which ring locks. the seal device on the shaft according to the above mentioned Swedish patent. The socket will then be so firmly pressed between the shaft and the fastening ring which is attached to the shaft, that a perfect driving is obtained.
  • the socket thus serves as a spring for pressing the two seal rings towards each other as well as a protection against incoming pollutions.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mechanical Sealing (AREA)
  • Sealing Devices (AREA)

Abstract

The invention concerns a seal device comprising a rotating and a non rotating seal ring, a so-called mechanical seal.The rotating (2) and non rotating (3) rings are pressed towards each other by an elastic socket (4) surrounding the shaft (1).

Description

  • Subject application concerns a seal device for shafts comprising a rotating and a non rotating seal ring which are pressed towards each other by spring force, so-called mechanical seals.
  • Such seals are normally used in different types of machines containing rotating shafts for instance submersible machines such as pumps and turbines.
  • One of the problems involved is to attach the rotating ring rigidly to the shaft, especially if the latter must not be weakened by key ways. This problem has been solved by help of a special grip ring which locks the seal housing at a suitable location on a plain shaft. Compare the Swedish patent 7700504-9.
  • When pumping extremely polluted liquids or liquids giving layers in the pump units, such as waste water from dairies and lime industries, the problem arises that a concentration of such layers may fill the space around the seal in such a way that the spring force between the two seal rings is eliminated.
  • In order to protect the seal from that, a protection socket for the seal is arranged, which socket also obtains the needed springforce.
  • The invention is thus characterized by that the spring force is obtained by an elastic socket, for instance made of rubber, arranged around the shaft and which is non turnable attached to the shaft by a fastening ring and which is also pressed towards the rotating seal ring.
  • The invention is described more closely below with reference to the enclosed drawing.
  • In the drawing 1 stands for a rotating shaft, 2 och 3 a rotating and a non rotating seal ring resp, 4 a resilient socket, 5 a grip ring and 6 and 7 attach means for the socket.
  • The seal ring 2 is thus meant to rotate with the shaft, while the seal ring 3 is attached to non rotating parts in the machine. The spring force is obtained by a socket 4 made of flexible material, such as rubber, which may be reinforced with an insert of rigid material.
  • The socket 4 and the seal ring 2 are connected in that the socket concentrically surrounds a part of the seal ring and in that a pipe 6 is pressed around the socket while being plastically deformed.
  • In order to secure that the socket 4 rotates with the shaft 1 in an appropriate way, a fastening ring 7 is arranged around the socket which presses the latter towards the shaft. The ring 7 is connected to a grip ring 5 rigidly attached to the shaft, which ring locks. the seal device on the shaft according to the above mentioned Swedish patent. The socket will then be so firmly pressed between the shaft and the fastening ring which is attached to the shaft, that a perfect driving is obtained.
  • The socket thus serves as a spring for pressing the two seal rings towards each other as well as a protection against incoming pollutions.

Claims (3)

1 A sealing device for shafts comprising a rotating and a non rotating seal ring which are pressed towards each other by spring force, so-called mechanical seals, characterized in that the spring force is obtained by an elastic socket (4) for instance made of rubber, arranged around the shaft (1), and which is non turnable attached to the shaft by a fastening ring (7) and further pressed around the periphery of the rotating seal ring (2), said socket (4) also prevents pollutions from entering towards the sealing surfaces.
2 A device according to claim 1, characterized in that the fastening ring (7) is arranged around one end of the socket (4) and connected to a grip ring (5) which is non turnable attached to the shaft (1) thus preventing relative movement between the socket (4) and the shaft (1).
3 A device according to claim 2, characterized in that the other end of the socket (4) is pressed around the outer surface of the rotating seal ring (2) by a pipe (6) which is plastically deformed.
EP84850125A 1983-05-13 1984-04-17 Mechanical seal Expired EP0126048B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8302726A SE439821B (en) 1983-05-13 1983-05-13 AXEL SEALING DEVICE
SE8302726 1983-05-13

Publications (2)

Publication Number Publication Date
EP0126048A1 true EP0126048A1 (en) 1984-11-21
EP0126048B1 EP0126048B1 (en) 1987-03-11

Family

ID=20351185

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84850125A Expired EP0126048B1 (en) 1983-05-13 1984-04-17 Mechanical seal

Country Status (5)

Country Link
US (1) US4521025A (en)
EP (1) EP0126048B1 (en)
JP (1) JPS59212573A (en)
DE (1) DE3462621D1 (en)
SE (1) SE439821B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9606815D0 (en) * 1996-03-30 1996-06-05 Crane John Uk Ltd Mechanical face seals
CA2755240C (en) 2009-03-16 2017-11-07 Vulco S.A. Mechanical seal with improved seal assembly

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR874519A (en) * 1941-08-06 1942-08-10 Destoumieux & Schrynemaekers Seal for rotating shaft
US3185488A (en) * 1961-11-06 1965-05-25 Federal Mogul Bower Bearings Face seal
FR2134887A5 (en) * 1971-04-23 1972-12-08 Meca Ind Int

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB802386A (en) * 1956-10-12 1958-10-01 Steel Co Of Wales Ltd Improvements in or relating to sealing devices for rotating members
US3391942A (en) * 1965-09-17 1968-07-09 Sealol Rotary mechanical fluid seal
JPS4928735A (en) * 1972-07-08 1974-03-14
US4386785A (en) * 1981-04-21 1983-06-07 Crane Packing Limited Shaft seals including a seal element and a drive ring assembly therefor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR874519A (en) * 1941-08-06 1942-08-10 Destoumieux & Schrynemaekers Seal for rotating shaft
US3185488A (en) * 1961-11-06 1965-05-25 Federal Mogul Bower Bearings Face seal
FR2134887A5 (en) * 1971-04-23 1972-12-08 Meca Ind Int

Also Published As

Publication number Publication date
SE439821B (en) 1985-07-01
JPS59212573A (en) 1984-12-01
DE3462621D1 (en) 1987-04-16
EP0126048B1 (en) 1987-03-11
SE8302726L (en) 1984-11-14
US4521025A (en) 1985-06-04
JPH0325671B2 (en) 1991-04-08
SE8302726D0 (en) 1983-05-13

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